#include <iostream>
using namespace std;

int main()
{
	const double PI = 3.14159;
	
	//  Step 1: Read in radius
	double radius;
	cout << "Enter a radius: ";
	cin >> radius;
	
	// Step 2: Compute area
	double area = radius * radius * PI;
	
	// Step 3: Display the area
	cout << "The area is ";
	cout << area << endl;
	
	system("pause");
	return 0;
	
}
